Abstract
Monitoring systems utilising automated electronic total stations are an important element of controlling safety levels of numerous engineering structures. In order to ensure appropriate credibility of the obtained data, it is crucial to maintain the stability of both the parameters of the used instrument as well as of its setup. This study presents the results of research on the stability of the Leica TCRP1201+ instrument’s basic parameters and three selected tripods manufactured using different materials. In the case of the total station the inspected values included Hz-collimation, V-collimation, and tilt compensation errors. Two of the head tilt components and torsion were examined for each of the tripods. The research was carried out in three-day sessions in conditions of large temperature fluctuations. Graphs presenting the changes in the studied values were supplemented with analysis of correlation between the said changes and the changes in temperature. The conclusions section of the study includes suggestions on how to avoid the negative effects of changes in the geometry of the measuring device.
Highlights
Geodetic monitoring of deformations/displacements is an important element of the system ensuring safety of numerous types of engineering structures
The stability of a total station setup in such a manner depends on a number of factors and the possible changes should be taken into consideration when planning the survey and processing the obtained results
One can draw the following conclusions on the basis of the obtained measurement results: The studied instrument (TCRP1201+) turned out to be relatively highly resistant to fluctuations of external temperature, which makes measurements in one face a viable option. This possibility is further supported by the fact, that in the real field conditions the temperature fluctuations will rarely reach such high values as those observed during the test measurements
Summary
Geodetic monitoring of deformations/displacements is an important element of the system ensuring safety of numerous types of engineering structures It takes advantage of various surveying techniques, such as satellite measurement, photogrammetry, laser scanning, and inclinometric or classic linear and angular measurements. The stability of a total station setup in such a manner depends on a number of factors (type of the tripod, type of the base, changes in the weather conditions) and the possible changes should be taken into consideration when planning the survey and processing the obtained results. Notwithstanding the foregoing, one should take into consideration the occurrence of changes in the parameters of the instrument itself In particular it may concern the change in the orientation of line of sight in regard to the telescope which manifests itself as Hz- and V-collimation changes and zero point of the electronic vial used for compensation of the influence of tilt of the instrument’s vertical axis. The test site was selected so that the measurements coincided with largest possible changes in the temperature
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